The Dundrod + +  is the largest of our U-Locks.
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With an 18MM shackle it exceeds the Sold Secure Motorcycle gold rating and can be used in conjunction with a chain or, more likely, as a "stand alone" shackle lock. 
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Due to its size it can also be used by cyclists to secure their bicycle to street furniture.
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It's portable and simple to fit but offers a highly visible and secure option.